lantiq: fix some ethernet driver SMP issues

Signed-off-by: Felix Fietkau <nbd@nbd.name>

diff --git a/target/linux/lantiq/patches-4.4/0025-NET-MIPS-lantiq-adds-xrx200-net.patch b/target/linux/lantiq/patches-4.4/0025-NET-MIPS-lantiq-adds-xrx200-net.patch
index 07df336d2fbb1600162858157bd056bc98de0171..2d71ffafb85bfecd2d7d6bd013471b5ebbf1c4f8 100644 (file)
--- a/target/linux/lantiq/patches-4.4/0025-NET-MIPS-lantiq-adds-xrx200-net.patch
+++ b/target/linux/lantiq/patches-4.4/0025-NET-MIPS-lantiq-adds-xrx200-net.patch
@@ -209,7 +209,7 @@ Subject: [PATCH 25/36] NET: MIPS: lantiq: adds xrx200-net
 +};
 --- /dev/null
 +++ b/drivers/net/ethernet/lantiq_xrx200.c
-@@ -0,0 +1,1830 @@
+@@ -0,0 +1,1836 @@
 +/*
 + *   This program is free software; you can redistribute it and/or modify it
 + *   under the terms of the GNU General Public License version 2 as published
@@ -1090,7 +1090,7 @@ Subject: [PATCH 25/36] NET: MIPS: lantiq: adds xrx200-net
 +      for (i = 0; i < priv->num_port; i++)
 +              if (priv->port[i].phydev)
 +                      phy_start(priv->port[i].phydev);
-+      netif_start_queue(dev);
++      netif_wake_queue(dev);
 +
 +      return 0;
 +}
@@ -1262,6 +1262,7 @@ Subject: [PATCH 25/36] NET: MIPS: lantiq: adds xrx200-net
 +      struct xrx200_chan *ch = &priv->hw->chan[XRX200_DMA_TX];
 +      struct ltq_dma_desc *desc = &ch->dma.desc_base[ch->dma.desc];
 +      u32 byte_offset;
++      int ret = NETDEV_TX_OK;
 +      int len;
 +#ifdef SW_ROUTING
 +      u32 special_tag = (SPID_CPU_PORT << SPID_SHIFT) | DPID_ENABLE;
@@ -1270,11 +1271,6 @@ Subject: [PATCH 25/36] NET: MIPS: lantiq: adds xrx200-net
 +      skb->dev = dev;
 +      len = skb->len < ETH_ZLEN ? ETH_ZLEN : skb->len;
 +
-+      if ((desc->ctl & (LTQ_DMA_OWN | LTQ_DMA_C)) || ch->skb[ch->dma.desc]) {
-+              netdev_err(dev, "tx ring full\n");
-+              netif_stop_queue(dev);
-+              return NETDEV_TX_BUSY;
-+      }
 +#ifdef SW_ROUTING
 +      if (is_multicast_ether_addr(eth_hdr(skb)->h_dest)) {
 +              u16 port_map = priv->port_map;
@@ -1309,11 +1305,19 @@ Subject: [PATCH 25/36] NET: MIPS: lantiq: adds xrx200-net
 +
 +      /* dma needs to start on a 16 byte aligned address */
 +      byte_offset = CPHYSADDR(skb->data) % 16;
++
++      spin_lock_bh(&priv->hw->lock);
++      if ((desc->ctl & (LTQ_DMA_OWN | LTQ_DMA_C)) || ch->skb[ch->dma.desc]) {
++              netdev_err(dev, "tx ring full\n");
++              netif_stop_queue(dev);
++              ret = NETDEV_TX_BUSY;
++              goto out;
++      }
++
 +      ch->skb[ch->dma.desc] = skb;
 +
 +      dev->trans_start = jiffies;
 +
-+      spin_lock_bh(&priv->hw->lock);
 +      desc->addr = ((unsigned int) dma_map_single(NULL, skb->data, len,
 +                                              DMA_TO_DEVICE)) - byte_offset;
 +      wmb();
@@ -1324,12 +1328,14 @@ Subject: [PATCH 25/36] NET: MIPS: lantiq: adds xrx200-net
 +      if (ch->dma.desc == ch->tx_free)
 +              netif_stop_queue(dev);
 +
-+      spin_unlock_bh(&priv->hw->lock);
 +
 +      priv->stats.tx_packets++;
 +      priv->stats.tx_bytes+=len;
 +
-+      return NETDEV_TX_OK;
++out:
++      spin_unlock_bh(&priv->hw->lock);
++
++      return ret;
 +}
 +
 +static irqreturn_t xrx200_dma_irq(int irq, void *priv)